BirdAnalyst
Species · Wisconsin · BBS 2026 Release · 1966–2025

Hairy Woodpecker Population Trend in Wisconsin

All statesForest birds

Hairy Woodpecker in Wisconsin has surged: up 204% on the route-weighted index since 1968.

+204%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
98Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Hairy Woodpecker Trends in WisconsinNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Hairy Woodpecker has surged in Wisconsin: up 204% on the route-weighted index since 1968.

Hairy Woodpecker Population Forecast in Wisconsin

If the recent trend holds, Hairy Woodpecker in Wisconsin is projected to stay roughly flat through 2030, near 1.4 (95% range 1.0–1.8). A 5-year backtest shows a typical error of ±11.3%, with 100% of held-out values landing inside the 95% band.

+2%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
1.4Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.0–1.895% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±11.3%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Hairy Woodpecker in Wisconsin is projected to stay roughly flat through 2030, near 1.4 (95% range 1.0–1.8). A 5-year backtest shows a typical error of ±11.3%, with 100% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20261.41.001.8
20271.41.01.8
20281.41.01.8
20291.41.01.8
20301.41.01.8

Hairy Woodpecker Survey Routes in Wisconsin

Routes recording Hairy Woodpecker in Wisconsin.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Wausaukee720251984
Holway619881967
Cavour620251998
Meridean620251998
Gresham520251998
Prairie Du Chien520241998
Chaffey420251966
Rib Lake420191966
Popple River420251970
Grand View320251966
Loraine320181966
Eagle River320251966
Amberg320251980
Washington I320251967
Manitowoc320241979
Pardeeville320251985
Fall River320251989
Land O' Lakes 2320242017
Mellen320241998
Conover320251998
Weirgor Springs320251999
Shanagolden220251975
Union Twp220251966
Weyerhauser220251972
Gilman220251969

Hairy Woodpecker Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.